mongodb 0.9.1

The official MongoDB driver for Rust (currently in alpha)
Documentation 
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data:
    - {_id: 1, x: 11}
    - {_id: 2, x: 22}
    - {_id: 3, x: 33}

tests:
    -
        description: "FindOneAndReplace when many documents match returning the document before modification"
        operation:
            name: findOneAndReplace
            arguments:
                filter: 
                    _id: {$gt: 1}
                replacement: {x: 32}
                projection: {x: 1, _id: 0}
                sort: {x: 1}

        outcome:
            result: {x: 22}
            collection:
                data:
                    - {_id: 1, x: 11}
                    - {_id: 2, x: 32}
                    - {_id: 3, x: 33}
    -
        description: "FindOneAndReplace when many documents match returning the document after modification"
        operation:
            name: findOneAndReplace
            arguments:
                filter: 
                    _id: {$gt: 1}
                replacement: {x: 32}
                projection: {x: 1, _id: 0}
                returnDocument: After
                sort: {x: 1}

        outcome:
            result: {x: 32}
            collection:
                data:
                    - {_id: 1, x: 11}
                    - {_id: 2, x: 32}
                    - {_id: 3, x: 33}
    -
        description: "FindOneAndReplace when one document matches returning the document before modification"
        operation:
            name: findOneAndReplace
            arguments:
                filter: {_id: 2}
                replacement: {x: 32}
                projection: {x: 1, _id: 0}
                sort: {x: 1}

        outcome:
            result: {x: 22}
            collection:
                data:
                    - {_id: 1, x: 11}
                    - {_id: 2, x: 32}
                    - {_id: 3, x: 33}
    -
        description: "FindOneAndReplace when one document matches returning the document after modification"
        operation:
            name: findOneAndReplace
            arguments:
                filter: {_id: 2}
                replacement: {x: 32}
                projection: {x: 1, _id: 0}
                returnDocument: After
                sort: {x: 1}

        outcome:
            result: {x: 32}
            collection:
                data:
                    - {_id: 1, x: 11}
                    - {_id: 2, x: 32}
                    - {_id: 3, x: 33}
    -
        description: "FindOneAndReplace when no documents match returning the document before modification"
        operation:
            name: findOneAndReplace
            arguments:
                filter: {_id: 4}
                replacement: {x: 44}
                projection: {x: 1, _id: 0}
                sort: {x: 1}

        outcome:
            result: null
            collection:
                data:
                    - {_id: 1, x: 11}
                    - {_id: 2, x: 22}
                    - {_id: 3, x: 33}
    -
        description: "FindOneAndReplace when no documents match returning the document after modification"
        operation:
            name: findOneAndReplace
            arguments:
                filter: {_id: 4}
                replacement: {x: 44}
                projection: {x: 1, _id: 0}
                returnDocument: After
                sort: {x: 1}

        outcome:
            result: null
            collection:
                data:
                    - {_id: 1, x: 11}
                    - {_id: 2, x: 22}
                    - {_id: 3, x: 33}